发明名称 |
Method of and apparatus for noise reduction in multigradation image signal. |
摘要 |
A multi-gradation image signal obtained by multi-gradationisation of a signal obtained by reading through a CCD (1) on original having a half tone is supplied to an unsharp signal producing part (5), which in turn outputs an unsharp signal (SU) produced from the multi-gradation image signal and the multi-gradation image signal (SS) itself. A comparator (12) discriminates a shadow portion of the original by comparing the multi-gradation image signal (SS) with a reference value. As a result, a signal which is unsharp in the shadow portion of the original is produced from the multi-gradation image signal (SS) and the unsharp signal (SU). |
申请公布号 |
EP0271912(A2) |
申请公布日期 |
1988.06.22 |
申请号 |
EP19870118768 |
申请日期 |
1987.12.17 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
MURAKAMI, SHIGEO DAINIPPON SCREEN MFG. CO LTD. 1-1 |
分类号 |
H04N1/19;H04N1/409 |
主分类号 |
H04N1/19 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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